CN105945253A - Roll gap control method after bleed-out of slab caster - Google Patents
Roll gap control method after bleed-out of slab caster Download PDFInfo
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- CN105945253A CN105945253A CN201610560529.8A CN201610560529A CN105945253A CN 105945253 A CN105945253 A CN 105945253A CN 201610560529 A CN201610560529 A CN 201610560529A CN 105945253 A CN105945253 A CN 105945253A
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- roll gap
- bleed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
- B22D11/202—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by measuring temperature
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Abstract
The invention discloses a roll gap control method after bleed-out of a slab caster. The roll gap control method comprises the following steps: S1, monitoring a three-dimensional temperature field (Tfield) of a continuous casting billet online in real time; S2, obtaining the volume Vsafe of molten steel with liquidity characteristics between a meniscus of a crystallizer and a safety line position of the slab caster at the current moment, and obtaining the volume Vsegment of the molten steel with the liquidity characteristics in a fan-shaped segment with the capability of remotely adjusting the roll gap at the current moment; S3, assuming that the Vsegment is increased to Vsegment1, calculating a variable quantity delta Gapbreakout between a fan-shaped segment roll gap value corresponding to the Vsegment1 and a fan-shaped segment roll gap value corresponding to the Vsegment; and S4, if the bleed-out occurs, immediately increasing the variable quantity delta Gapbreakout of the fan-shaped segment roll gap value to the fan-shaped segment roll gap value corresponding to the Vsegment1, and otherwise, returning to the S1. According to the roll gap control method disclosed by the invention, the risk that a large amount of molten steel leaks from a bleed-out part during the bleed-out is avoided, the damage degree of mechanical equipment is reduced, and the handling difficulty after the bleed-out is reduced; and meanwhile, by reasonably controlling the fan-shaped segment roll gap, the defect that center bursts are generated on casting billets can be avoided.
Description
Technical field
The invention belongs to continuous casting technology field, relate to a kind of gap preset method after slab caster generation bleed-out.
Background technology
In all kinds of accidents that continuous casting produces, infringement the most seriously bleed-out accident.Bleed-out refers to that in casting process, solidified shell goes out knot
After brilliant device, green shell keeps out incessantly ferrostatic pressure and the effect of throwing power, occurs fracture to make molten steel flow out at weakness.Bleed-out is not
Only can affect continuous casting to produce, make plant equipment suffer damage, increase maintenance capacity and maintenance cost, and entail dangers to personal safety.
Along with the development of technology, although the incidence rate of current bleed-out accident is greatly reduced, but due to a variety of causes, meeting can not
The generation avoided.When there is bleed-out, currently mainly relying on experience to process, closing submersed nozzle, the roller of fan-shaped section
Seam is opened to maximum.
Said method processes not prompt enough, and molten steel flows out at bleed-out in a large number, makes plant equipment suffer damage, has increased the weight of plant equipment
The extent of damage, adds the intractability after there is bleed-out, and can cause strand centre burst defect.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of gap preset method after slab caster generation bleed-out, the method based on
Real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field, after there is bleed-out, adjusts in real time and has mobility spy
The segment roll gap value that the molten steel levied is corresponding.When avoiding generation bleed-out, the risk that molten steel flows out at bleed-out in a large number, alleviate machine
The tool equipment extent of damage, is reduced the intractability after there is bleed-out, is controlled by rational segment roll gap simultaneously, can avoid casting
Base produces centre burst defect.
It is an object of the invention to be achieved through the following technical solutions, the gap preset side after a kind of slab caster generation bleed-out
Method, comprises the steps:
S1. real time and on line monitoring continuous casting billet three-dimensional temperature field Tfield；
S2. according to the most real-time continuous casting billet three-dimensional temperature field, calculate and obtain current time crystallizer meniscus to conticaster safety line
Position has the molten steel volume V of mobility featuresafe, calculate in obtaining current time conticaster and there is remote adjustment gap values between rollers ability
There is in fan-shaped section the molten steel volume V of mobility featuresegment；
S3. V is supposedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value and Vsegment
The corresponding variable quantity △ Gap between segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. if it occur that bleed-out/crystallizer overflows, steel/mold liquid level declines suddenly, the most at once by the variable quantity of segment roll gap value
△GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment completes；Otherwise go to step S1.
Further, in described step S1, by real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field.
Further, the molten steel with mobility feature is relevant with the coefficient of fluidity δ of casting steel grade.
Further, conticaster safety line position is relevant with the structure of conticaster.
Further, the variable quantity of segment roll gap value is regulated by multiple fan-shaped section, by the variable quantity △ Gap of segment roll gap valuebreakout
Increase to Vsegment1Corresponding segment roll gap value, multiple fan-shaped section are to synchronize to perform.
Further, step S1～S4 controlled the cycle less than 10 seconds.
Owing to have employed technique scheme, present invention have the advantage that:
When present invention, avoiding generation bleed-out, the risk that molten steel flows out at bleed-out in a large number, alleviate the plant equipment extent of damage, fall
Low there is the intractability after bleed-out, control by rational segment roll gap simultaneously, strand generation centre burst defect can be avoided.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is made the most in detail
Thin description, wherein:
Fig. 1 is conticaster schematic diagram；
Fig. 2 is real-time on-line simulation casting stream temperature field schematic diagram；
Fig. 3 is temperature field, real-time on-line simulation cross section schematic diagram.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment only for
The present invention is described rather than in order to limit the scope of the invention.
Wherein zero section is vertical curve section, and 1～6 section is segmental arc, and 7～8 sections is straightening section, and 9～14 sections is horizontal segment, and 1～14 all
For long-range gap preset fan-shaped section.
A kind of gap preset method after slab caster generation bleed-out, comprises the steps:
S1. by real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field Tfield；
S2. according to the most real-time continuous casting billet three-dimensional temperature field, calculate and obtain current time crystallizer meniscus to conticaster safety line
Position has the molten steel volume V of mobility featuresafe, calculate in obtaining current time conticaster and there is remote adjustment gap values between rollers ability
There is in fan-shaped section the molten steel volume V of mobility featuresegment；There is the molten steel of mobility feature and the mobility system of casting steel grade
δ is relevant for number, and the safety line position of conticaster is relevant with the structure of conticaster.
S3. V is supposedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value and Vsegment
The corresponding variable quantity △ Gap between segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. if it occur that bleed-out/crystallizer overflows, steel/mold liquid level declines suddenly, the most at once by the variable quantity of segment roll gap value
△GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment completes；Otherwise go to step S1.
In the present invention, the variable quantity of segment roll gap value is regulated by multiple fan-shaped section, by the variable quantity of segment roll gap value
△GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, multiple fan-shaped section are to synchronize to perform.
Described step S1～S4 control the cycle should be less than 10 seconds.
The present invention is not only suitable for the gap preset after bleed-out, is also adapted to crystallizer and overflows steel and mold liquid level declines suddenly.
Embodiment 1
It is 250mm × 1870mm strand that certain steel mill uses straight circular-arc type continuous casting machine to produce section, and production steel grade is X, and pulling rate is
0.95m/min, cast temperature is 1539 DEG C, and wherein zero section is vertical curve section, and 1～6 section is segmental arc, and 7～8 sections is straightening section,
9～14 sections is horizontal segment, and 1～14 is all long-range gap preset fan-shaped section.
Specifically comprise the following steps that
1) in casting machine production process, by Three-Dimensional Simulation of Temperature Fields model real-time tracking casting machine three-dimensional temperature field；
2) in this example, this conticaster safety line position takes 0.94 (i.e. away from crystallizer meniscus 1.1m, the coefficient of fluidity δ of casting steel grade
Meet TStrand>=δ TliqFor having the molten steel of mobility feature, wherein TStrandFor the temperature of strand position, TliqFor casting steel grade
Liquidus temperature).According to the most real-time three-dimensional temperature field, calculate and obtain current time crystallizer meniscus to conticaster safety
Line position has the molten steel volume V of mobility featuresafe=0.41939304m3, calculate to obtain in current time conticaster and have remotely
There is in the fan-shaped section of regulation gap values between rollers ability the molten steel volume V of mobility featuresegment=1.468335193m3；
3) V is supposedsegmentIncrease to (Vsegment+Vsafe) time, calculate current time VsegmentCorresponding segment roll gap
The variable quantity △ Gap of valuebreakout: △ SegmentIn01=0.481, △ SegmentOut01=0.362；
△ SegmentIn02=0.343, △ SegmentOut02=0.244；△ SegmentIn03=0.229,
Δ SegmentOut03=0.143；Δ SegmentIn04=0.130, Δ SegmentOut04=0.055；
Δ SegmentIn05=0.044, Δ SegmentOut05=0.009, Segment06～Segment14 roll gap variable quantity is zero.
4) if it occur that bleed-out, the most at once by step 3) in variation delta Gap of current time segment roll gap value that calculatesbreakout
Increase to (Vsegment+VsafeUntil accident treatment completes in segment roll gap value corresponding to)；Otherwise go to step 1).
In production process, contrast does not use the method to process scene and the slab quality that bleed-out accident occurs, and finds to have employed the party
After method, molten steel is the most a small amount of at bleed-out to flow out, and alleviates greatly the plant equipment extent of damage, after reducing generation bleed-out
Intractability, by sampling and carry out strand low power analysis, contrast does not has the casting blank sample of the method used, finds have employed
The strand centre burst defect of the method disappears.
The present invention steel grade to being produced, without particular/special requirement, may be used for the various steel grades that current each factory produces.
The present invention to conticaster pulling rate without particular/special requirement, it is adaptable to various pulling rates.
The present invention is applicable to all slab caster types in addition to horizontal type continuous casting machine.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, it is clear that those skilled in the art is permissible
The present invention is carried out various change and modification without departing from the spirit and scope of the present invention.So, if the present invention these amendment and
Modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and modification exists
In.
Claims (6)
1. the gap preset method after a slab caster generation bleed-out, it is characterised in that: comprise the steps:
S1. real time and on line monitoring continuous casting billet three-dimensional temperature field Tfield；
S2. according to the most real-time continuous casting billet three-dimensional temperature field, calculate and obtain current time crystallizer meniscus to conticaster safety line
Position has the molten steel volume V of mobility featuresafe, calculate in obtaining current time conticaster and there is remote adjustment gap values between rollers energy
There is in the fan-shaped section of power the molten steel volume V of mobility featuresegment；
S3. V is supposedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value and Vsegment
The corresponding variable quantity △ Gap between segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. if it occur that bleed-out/crystallizer overflows, steel/mold liquid level declines suddenly, the most at once by the variable quantity of segment roll gap value
△GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment completes；Otherwise go to step S1.
Gap preset method after a kind of slab caster generation bleed-out the most according to claim 1, it is characterised in that: described step
In rapid S1, by real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field.
Gap preset method after a kind of slab caster generation bleed-out the most according to claim 1, it is characterised in that: there is stream
The molten steel of dynamic property feature is relevant with the coefficient of fluidity δ of casting steel grade.
Gap preset method after a kind of slab caster generation bleed-out the most according to claim 1, it is characterised in that: conticaster
Safety line position is relevant with the structure of conticaster.
Gap preset method after a kind of slab caster generation bleed-out the most according to claim 1, it is characterised in that: fan-shaped section
The variable quantity of gap values between rollers is regulated by multiple fan-shaped section, by the variable quantity △ Gap of segment roll gap valuebreakoutIncrease to Vsegment1Institute is right
The segment roll gap value answered, multiple fan-shaped section are to synchronize to perform.
Gap preset method after a kind of slab caster generation bleed-out the most according to claim 1, it is characterised in that: step
S1～S4 controlled the cycle less than 10 seconds.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008877A (en) * | 2017-04-25 | 2017-08-04 | 中冶赛迪工程技术股份有限公司 | A kind of control method for improving continuous casting machine roll-gap precision |
| CN107008874A (en) * | 2017-03-29 | 2017-08-04 | 东北大学 | A kind of continuous casting billet solidifying end pressing control method during unsteady statecalculation |
| CN114951578A (en) * | 2022-05-31 | 2022-08-30 | 北京高创智信冶金科技有限公司 | Soft reduction roll gap control method suitable for continuous casting square billet |
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| JPH09122845A (en) * | 1995-11-07 | 1997-05-13 | Sumitomo Metal Ind Ltd | Method for completing casting in continuous casting |
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| JPH09122845A (en) * | 1995-11-07 | 1997-05-13 | Sumitomo Metal Ind Ltd | Method for completing casting in continuous casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008874A (en) * | 2017-03-29 | 2017-08-04 | 东北大学 | A kind of continuous casting billet solidifying end pressing control method during unsteady statecalculation |
| CN107008874B (en) * | 2017-03-29 | 2018-11-27 | 东北大学 | A kind of continuous casting billet solidifying end pressing control method during unsteady statecalculation |
| CN107008877A (en) * | 2017-04-25 | 2017-08-04 | 中冶赛迪工程技术股份有限公司 | A kind of control method for improving continuous casting machine roll-gap precision |
| CN107008877B (en) * | 2017-04-25 | 2019-03-26 | 中冶赛迪工程技术股份有限公司 | A kind of control method improving continuous casting machine roll-gap precision |
| CN114951578A (en) * | 2022-05-31 | 2022-08-30 | 北京高创智信冶金科技有限公司 | Soft reduction roll gap control method suitable for continuous casting square billet |
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| CN105945253B (en) | 2017-11-10 |
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